/Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/GeometryCollection.h
Append a single geometric object to aFGeometryCollection
int32 AppendGeometry ( const [FGeometryCollection](API\Runtime\Chaos\GeometryCollection\FGeometryCollection) & GeometryCollection, int32 MaterialIDOffset, bool ReindexAllMaterials, const FTransform & TransformRoot )